Note 21 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Securities available for sale:
U.S. govt. sponsored agency securities	$ 323,434,982	$ 451,659,630
Derivative instruments	856,024	1,487,387
	324,291,006	453,147,017
Impaired loans/leases	12,268,677	26,256,409
Impaired Loans/Leases [Member]
Securities available for sale:
Impaired loans/leases	4,545,966	12,467,362
Other Real Estate Owned [Member]
Securities available for sale:
Impaired loans/leases	7,722,711	13,789,047
US Government Agencies Debt Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	213,537,379	307,869,572
Residential Mortgage Backed Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	80,670,135	111,423,224
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	27,578,588	30,399,981
Other Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	1,648,880	1,966,853
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
	411	345,952
Fair Value, Inputs, Level 1 [Member] | Other Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	411	345,952
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Derivative instruments	856,024	1,487,387
	324,290,595	452,801,065
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	213,537,379	307,869,572
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	80,670,135	111,423,224
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	27,578,588	30,399,981
Fair Value, Inputs, Level 2 [Member] | Other Securities [Member]
Securities available for sale:
U.S. govt. sponsored agency securities	1,648,469	1,620,901
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Impaired loans/leases	12,268,677	26,256,409
Fair Value, Inputs, Level 3 [Member] | Impaired Loans/Leases [Member]
Securities available for sale:
Impaired loans/leases	4,545,966	12,467,362
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Securities available for sale:
Impaired loans/leases	$ 7,722,711	$ 13,789,047